package com.sgj.springcloud.service;

import cn.hutool.core.util.IdUtil;
import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
import com.netflix.hystrix.contrib.javanica.annotation.HystrixProperty;
import org.springframework.stereotype.Service;
import org.springframework.web.bind.annotation.PathVariable;

import java.util.concurrent.TimeUnit;

/**
 * @Author: Guoji Shen
 * @Date: 2021/5/19 15:06
 */
@Service
public class PaymentService {

    /**
     * 正常访问，肯定 OK
     * @param id
     * @return
     */
    public String paymentInfo_OK(Integer id) {
        return "线程池：" + Thread.currentThread().getName() + "  paymentInfo_OK,id：" + id + "\t哈哈哈";
    }

    // 兜底策略，如果该方法挂掉了，那么则去找 paymentInfo_TimeOutHandler() 方法
    @HystrixCommand(fallbackMethod = "paymentInfo_TimeOutHandler", commandProperties = {
            // 设置峰值为 3s，超过 3s 则会调用 paymentInfo_TimeOutHandler() 方法
            @HystrixProperty(name = "execution.isolation.thread.timeoutInMilliseconds", value = "5000")
    })
    public String paymentInfo_TimeOut(Integer id) {
        // int timeNumber = 10 / 0;
        int timeNumber = 3;
        try {
            TimeUnit.SECONDS.sleep(timeNumber);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        return "线程池：" + Thread.currentThread().getName() + "  paymentInfo_TimeOut,id：" + id + "\t哈哈哈，耗时" + timeNumber + "秒";
    }

    public String paymentInfo_TimeOutHandler(Integer id) {
        return "线程池：" + Thread.currentThread().getName() + "  系统繁忙或者报错，请稍后再试,id：" + id + "\t我挂掉了";
    }


    // =========================================== 服务熔断 ========================================================
    @HystrixCommand(fallbackMethod = "paymentCircuitBreaker_fallback", commandProperties = {
            // 是否开启断路器
            @HystrixProperty(name = "circuitBreaker.enabled", value = "true"),
            // 请求次数
            @HystrixProperty(name = "circuitBreaker.requestVolumeThreshold", value = "10"),
            // 时间窗口期
            @HystrixProperty(name = "circuitBreaker.sleepWindowInMilliseconds", value = "1000"),
            // 失败率达到多少后跳闸
            @HystrixProperty(name = "circuitBreaker.errorThresholdPercentage", value = "60"),
    })
    public String paymentCircuitBreaker(@PathVariable("id") Integer id) {
        if (id < 0) {
            throw new RuntimeException("******id 不能为复数");
        }
        String serialNumber = IdUtil.simpleUUID();

        return Thread.currentThread().getName() + "\t" + "调用成功，流水号：" + serialNumber;
    }

    public String paymentCircuitBreaker_fallback(@PathVariable("id") Integer id) {
        return "id 不能为负数，请稍后再试。  id：" + id;
    }
}
